In this article

Executive Summary

This security update resolves a vulnerability in Microsoft Windows. The vulnerability could allow elevation of privilege if an attacker with physical access inserts a specially crafted USB device into the system.

Affected Software and Vulnerability Severity Ratings

The following software versions or editions are affected. Versions or editions that are not listed are either past their support life cycle or are not affected. To determine the support life cycle for your software version or edition, see Microsoft Support Lifecycle.

The severity ratings indicated for each affected software assume the potential maximum impact of the vulnerability. For information regarding the likelihood, within 30 days of this security bulletin’s release, of the exploitability of the vulnerability in relation to its severity rating and security impact, please see the Exploitability Index in the March bulletin summary.

[2]Windows 10 updates are cumulative. In addition to containing non-security updates, they also contain all of the security fixes for all of the Windows 10-affected vulnerabilities shipping with the monthly security release. The update is available via the Windows Update Catalog.

Note Windows Server Technical Preview 4 is affected. Customers running this operating system are encouraged to apply the update, which is available via Windows Update.

*The Updates Replaced column shows only the latest update in any chain of superseded updates. For a comprehensive list of updates replaced, go to the Microsoft Update Catalog, search for the update KB number, and then view update details (updates replaced information is provided on the Package Details tab).

Vulnerability Information

USB Mass Storage Elevation of Privilege Vulnerability-CVE-2016-0133

This security update resolves an elevation of privilege vulnerability in Microsoft Windows when the Windows USB Mass Storage Class driver fails to properly validate objects in memory. An attacker who successfully exploited this vulnerability could run arbitrary code in kernel mode. An attacker could then install programs; view, change, or delete data; or create new accounts with full user rights.

To exploit this vulnerability, an attacker would first have to have physical access to the system. An attacker could then insert a specially crafted USB device that could exploit the vulnerability and take control of an affected system. The update addresses this vulnerability by correcting how the Windows USB Mass Storage Class driver handles objects in memory.

The following table contains a link to the standard entry for each vulnerability in the Common Vulnerabilities and Exposures list:

### Mitigating Factors
Microsoft has not identified any [mitigating factors](https://technet.microsoft.com/library/security/dn848375.aspx) for this vulnerability.
### Workarounds
Microsoft has not identified any [workarounds](https://technet.microsoft.com/library/security/dn848375.aspx) for this vulnerability.
Security Update Deployment
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For Security Update Deployment information, see the Microsoft Knowledge Base article referenced [here](#kbarticle) in the Executive Summary.
Acknowledgments
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Microsoft recognizes the efforts of those in the security community who help us protect customers through coordinated vulnerability disclosure. See [Acknowledgments](https://technet.microsoft.com/en-us/library/security/mt674627.aspx) for more information.
Disclaimer
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The information provided in the Microsoft Knowledge Base is provided "as is" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply.
Revisions
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- V1.0 (March 8, 2016): Bulletin published.
- V2.0: (April 12, 2016) To comprehensively address CVE-2016-0133, Microsoft is releasing April Windows 10 Cumulative Update. Microsoft recommends that customers running affected versions of Microsoft Windows 10 (update 3140745) should install update 3147461. See [Microsoft Knowledge Base Article 3140745](https://support.microsoft.com/kb/3140745) for more information.
*Page generated 2016-04-12 10:01-07:00.*